819ebe7356
Add flockfile(), ftrylockfile() and funlockfile() functions [1].
[1] POSIX.1-2008 / System Interfaces / flockfile
https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/functions/flockfile.html
Signed-off-by: Miguel Herranz <miguel@midokura.com>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_puts.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/uio.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: puts
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*
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* Description:
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* puts() writes the string s and a trailing newline to stdout.
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*
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****************************************************************************/
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int puts(FAR const IPTR char *s)
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{
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#ifdef CONFIG_FILE_STREAM
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FILE *stream = stdout;
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int nwritten;
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int nput = EOF;
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int ret;
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/* Write the string (the next two steps must be atomic) */
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flockfile(stream);
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/* Write the string without its trailing '\0' */
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nwritten = fputs(s, stream);
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if (nwritten > 0)
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{
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/* Followed by a newline */
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char newline = '\n';
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ret = lib_fwrite(&newline, 1, stream);
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if (ret > 0)
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{
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nput = nwritten + 1;
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/* Flush the buffer after the newline is output if line buffering
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* is enabled.
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*/
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if ((stream->fs_flags & __FS_FLAG_LBF) != 0)
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{
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ret = lib_fflush(stream, true);
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if (ret < 0)
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{
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nput = EOF;
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}
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}
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}
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}
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funlockfile(stdout);
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return nput;
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#else
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size_t len = strlen(s);
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struct iovec iov[2];
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iov[0].iov_base = (FAR void *)s;
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iov[0].iov_len = len;
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iov[1].iov_base = "\n";
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iov[1].iov_len = 1;
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return writev(STDOUT_FILENO, iov, 2) == ++len ? len : EOF;
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#endif
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}
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